3 ms·

Get a pencil, now wrap a piece of string around it. The string protrudes from the pencil "shaft body" as per a screw. Conversely in a bolt, the thread is machi

by 4ndr3vv 10y ago

Get a pencil, now wrap a piece of string around it. The string protrudes from the pencil "shaft body" as per a screw. Conversely in a bolt, the thread is machined into the shaft; imagine carving the line that the string made into the pencil (so that you are removing rather than adding material) to produce the thread.

ghshephard 10y ago
So you are saying that if the threads are sunken below the shaft, then that suggests you have a bolt, but if the threads are above the surface of the shaft - that suggests screw? Now on a quest to find a screw with threads sunken into the shaft, defining said screw as something that is only tightened by applying pressure to the head.
- Someone 10y ago
  https://www.boltdepot.com/Product-Details.aspx?product=1884 https://www.boltdepot.com/Product-Details.aspx?product=1884 almost is fully sunken into the shaft ("no, the shaft gets thinner" IMO is not a valid argument)
  - ghshephard 10y ago
    But that's a case where the threads are definitely external, not internal to the shaft. The threads are the skinny part, and they are raised above the shaft in the version you just sent.
    - Someone 10y ago
      How do you know whether the whole shaft was equal in width to what's now closest to the head and something was cut away or whether it was smaller to start with, and something was added? Or,is your argument that this could be a screw: /\_/\_/\_/\_ \ _ _ _ _ / \/ \/ \/ \/ but this _ _ _ _ _/ \/ \/ \/ \ \ _/ \_/\_/\_/\_/ cannot be because the outside isn't sharp enough to 'bite' into the material it is screwed into? I can see the latter holding in rubbery material that tears easily.
      - ghshephard 10y ago
        First, hero points for doing a text based screw description. Second, I assume that 100% of screws and bolts are created by cutting away - hard to imagine adding something to the outside of a shaft. The only question is whether the resulting threads are raised above the shaft (screw)- by cutting away the shaft, or sunken below (bolt), by leaving the shaft in place and cutting in the threads. I realize there is nuance here - which is why I"m interested in seeing if I can find a screw (or bolt) that seems to break this pattern.

by 4ndr3vv 10y ago

ghshephard 10y ago

So you are saying that if the threads are sunken below the shaft, then that suggests you have a bolt, but if the threads are above the surface of the shaft - that suggests screw? Now on a quest to find a screw with threads sunken into the shaft, defining said screw as something that is only tightened by applying pressure to the head.

Someone 10y ago
https://www.boltdepot.com/Product-Details.aspx?product=1884 https://www.boltdepot.com/Product-Details.aspx?product=1884 almost is fully sunken into the shaft ("no, the shaft gets thinner" IMO is not a valid argument)
- ghshephard 10y ago
  But that's a case where the threads are definitely external, not internal to the shaft. The threads are the skinny part, and they are raised above the shaft in the version you just sent.
  - Someone 10y ago
    How do you know whether the whole shaft was equal in width to what's now closest to the head and something was cut away or whether it was smaller to start with, and something was added? Or,is your argument that this could be a screw: /\_/\_/\_/\_ \ _ _ _ _ / \/ \/ \/ \/ but this _ _ _ _ _/ \/ \/ \/ \ \ _/ \_/\_/\_/\_/ cannot be because the outside isn't sharp enough to 'bite' into the material it is screwed into? I can see the latter holding in rubbery material that tears easily.
    - ghshephard 10y ago
      First, hero points for doing a text based screw description. Second, I assume that 100% of screws and bolts are created by cutting away - hard to imagine adding something to the outside of a shaft. The only question is whether the resulting threads are raised above the shaft (screw)- by cutting away the shaft, or sunken below (bolt), by leaving the shaft in place and cutting in the threads. I realize there is nuance here - which is why I"m interested in seeing if I can find a screw (or bolt) that seems to break this pattern.